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John Mcdonnell
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You need to do ANOVA and then multiple-comparisons corrections using Tukey HSD. R code looks roughly like this: myaov <- aov( rating ~ quality, data=mydata ) summary(myaov) # See if anything's sig. TukeyHSD(myaov) # See what's driving the significance with correction for multiple comparisons.
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Jun 27, 2012